Machine for pressing grooves in pasteboard sheets



Aug. 10, 1948. A. K. A. JoHANsS 2,446,594

' MACHINE FOR PRESSING' GROOVES IN PASTEBOARD SHEETS Filed Feb. 8, 1945.NA 2 Sheets-Sheet l INVENTOR. f Zi .Jajznol/ ATTORNEYS.

ug. 10, 1948. A, K, A, JOHANSSON 2,446,594

MACHINE FOR PRESSING GROOVES IN PASTEBOARD SHEETS Filed Feb. 8, 1945 2 Sheets-Sheet 2 Patented ug. 10, 1948 MACHINE. FOR PRESSINGIv GROOVES IN PASTEBOARD SHEETS l Arthur Konrad Anders Johansson, Goteborg, Sweden Application February s, 1945, serial No'. 576,880 In Sweden February 3, 1944 This invention relates to machines for pressing grooves in pasteboard sheets and more particularly to machines of that character where the grooves are formed by rollers. Such sheets are used for the manufacture of pasteboard boxes. The sheet, being provided with grooves crossing each other, is bent along the grooves to form the bottom, sides and top of the box. By the manufacture of these boxes it has been found that the pasteboard will burst in the grooves when the thickness of the sheet exceeds above a certain value for instance abovev 116- of an inch. The difficulty to obtain faultless grooves will increase still much more when two or more parallel grooves are made in the sheet at the same time.

The main object of the 'invention is to provide a machine by which faultless grooves can be made in thick pasteboard sheets deep enough for the easy bending of the sheet to form a box.

Another object of the invention is to provide a machine with guiding means to hold the sheet in a suitable form when the sheet is fed through the machine.

A still further object of the 'invention is to provide a machine with rollers and with adjusting means for these rollers to form grooves of different deepness in the sheet.

The invention further consists in the several novel features of construction and combination of parts hereinafter fully set forth and claimed.

The invention is clearly illustrated in the drawings accompanying this specilcation in which:

Figure 1 is a vertical cross section of the machine;

Fig. 2 is an end elevation Viewof the machine;

Fig. 3 is a magnified detail fragmental section of the driving means; and

Fig. 4 is a similar magnified detail fragmental section of the driving means in another embodiment.

In the embodiment shown in Fig. 1 of the drawings two pairs of rollers I, 2 and 3, 4 are arranged the one pair after the other, whereat the rollers I and 3 are placed above the rollers 2 and 4, `the roller I coacting with the roller 2 and the roller 3 coacting with the roller 4. The rollers I and 3 are provided each with a cam 40 and the rollers 2 and 4 each with a corresponding slot 4I adapted to form the grooves in the pasteboard sheets which are to be fed through the -machine between the rollers.

The upper rollers I and 3 are free rotating on still standing shaft pins 6 which are turnably arranged in bearings 1, 8 in an upper slide 9 displaceable along guides I Il in the cross direction 1 Claim. (Cl. 23S-58.1)

Cit

of the machine. In order to change the position of the slide the same is provided with a pinion I 3 to be turned by ahandle wheel II. The pinion coacts with a rack I4 stationary fastened to the frame `25 of the machine in the cross direction thereof. A central driving shaft I6 in bearings in the frame runs in the cross direction thereof through bearings I5 in the slide. The shaft is provided with a key way for a key in a chain wheel I'I or such like which chain Wheel rotates with the shaft and is moved with the slide. A chain wheel I9 fastened to the roller I and a chain wheel 2|] fastened to the roller 2 are driven by means of a common chain I8 from the chain wheel I'I.

In the same Way the underlying rollers 2 and 4 are arranged on abottom slide 3a displaceable along guides Illa in the cross direction of the machine by means of a pinion I3a, and a central driving shaft Ilia. p-rovided with a key way drives the rollers 2 and 4 by means of a chain l8r!l on corresponding chain wheels I'Ia, Illa, 20a. vThe central driving shafts I6, I6a coact by meansof a gearing 2| the gears of Whichare secured to said shafts. At the one end of the machine a main driving shaft 22 is arranged coupled to the lower central shaft IIa by means of a gearing 23 and is driven by a pulley 24 or other driving means. The pinion I3a coacts with a corresponding rackI4a.

lIn the front of the rollers I, 2, 3, 4 there is a guiding device 2B for the pasteboard sheet 5 and a feeding device r2'I with adjustable feed rolls 28, 29. Some of vthese rolls are driven from shafts coupled to any of the driving shafts I6, Ilia.

The sheet guiding device 26 consists of two shafts 32, 33, one above the other and running in the cross direction of the machine, each of them carrying a number of guide rolls; the shaft 32 with the guide rolls 34a., 34h, 34e, and the shaft 33 with the guide rolls 35a, 35h, 35e, 35d. The guide rolls are adjustable to different places along the shafts, being slidably mounted thereon, and the shaft 32 has adjustable bearings 36, so that the same can be adjusted towards the pasteboard sheet 5. The latter shaft preferably is driven, the rolls rotating with the shaft, but the shaft 33 preferably is stationary and the rolls thereon have free rotationon the shaft, being spaced, for instance, between collars adjustable on the shaft.

In the embodiment shown in the drawings the machine is built to make four parallel grooves in the pasteboard sheet at the same time, thus four aggregates A, B, C, D of groove making rollers are placed in a row in the cross direction of the ma.-

chine as shown in Fig. 2. The three guide rolls 34a, 34h, 34e in iront of them on the shaft 32 are arranged centrally between the four aggregates, and the four guide rolls 35a, 35h, 35o, 35d are placed each in fnont of one of the aggregates. According to the present invention the guide rolls 34a, 34h, 34o between the aggregates are arranged in such 'a way that the portions 5a of the pasteboard sheet between the grooving rollers are held in the shape of bows, whereas the guide rolls 35a, 35h, 35e, 35d straight in front of the aggregates are holding the sheet in the normalfeed plane.

The two groove making rollers in each pair are adjustable towards each other. The one rollery 2 (4) is arranged for rough adjustment and the other roller I (3) for ne adjustment.

The device for the rough adjustment consists therein as seen in Fig. 3, that the shaft pin Ba for the roller 2 is formed with an eccentric portion 36, on which the roller has free rotation. when the shaft pin is turned to different positions in the slide 19a. by means of a handle 31, the centre position Aof the roller is changed and the roller is'edjusted more near or more remote from the other roller in the roller pair. The device for the fine adiustrnent is 'arranged in the same way with' the Ydifference that a radially extending fork 38 fastened to 'the shaft pin E `is substituted for the handle 3l. Between the 'arms 'of this ork an eccentric-disc 39 is turnable on a pin fixed to the slide. By turning the eccentric disc the eccentricV portion 36 is turned and a ne adjustment 'of the miler 4is obtained.

It-lis of great importance that the cam 4I) and the slot 4I of the coacting rollers are very carefully adjusted in reference to the thickness of the pasteboard sheet. Also afsmall-erroneous adjustment in this respect will cause the bursting or the pasteooard in the groove on account of the `low cluctility 'of the pasteboard. ToA facilitate this adjustment and at the same time form the rollers to suit pastebcard sheets fof diii'erent thickness theorie roller which is intended for the slot is censtructed 'of two discs d2, `lil with a space between them corresponding to the slot, as shown in :embodiment-of Fig. 4. The discs vare axially adjustable and 4in this way the space `can be made more or less wide, and it has been proved that it is 'of vadvantage that there is no bottom in the space. The adjusting device can be of different art. In 'theembodiment shown the disc l2 has a screwthreade'd bushing Bil integral for instance to the 1c'l'iain wheel "Illa, Iandthe disc 13 is screwed on the bushing and held in position by vanut 45.

In operation the pasteboard sheet is 'fed 'forward to the-coasting rollers I and '2 between which the :groove is rolled when the cam in the roller I presses the pasteboard into the `slot of the roller 2 `during the rotation of the rollers. In the em- 'bodiment shown Athe groove is rolled between this rst pair of rollers to a part of its depth only, and will be rolled to full depth in the following pair of rollers 3, '4.

This is accomplished by adjusting the eccentric disc 39 and thereby turning the eccentric shaft portion 3.6 to a position such that the roller 3 is moved closer to its related roller 4 than the relative'positionof the rollers I and 2. Thus in pass mg between the first pair of rollers I and 2, a relatively shallow groove is rolled `in the sheet while in passing :the second pair of rollers 3 and fd the groove is 'further rolled to the full depth desired.'

vlThe precaution of successively rolling the groove is'however not sufficient to prevent the bursting oi the material 'when the p'ast'e'board exceeds a certain thickness. To obtain a satisfying result it is necessary on account of the low ductility of the material to have a surplus of material at the side of the groove when rolling the same. On account of this the pasteboard sheet before it reaches the rollers is formed to a bow 5a between theroller aggregates A, B, C and D by means of the guide rolls 34a, 34h and 3de thus compensating the need of material for the groove and removing the difficulty on account of the low ductility. Preferably the bow 5a for the first pair I, 2 of the rollers isormed so large that a smaller bow 5b is maintained for the second pair 3, 4 of the rollers wherethe groove is nished. In many cases it is however possible to nish the groove by means of onepair of rollers only, when the sheet has Vthe said .shape of a bow between the roller aggregates.

In' order to complete the sheet with cross grooves the machine coacts with a machine of the like type ,placed after the first machine in the cross direction thereof, so that the sheet, having left the first machine .will be fed sideways into the other machine where the cross grooves are made in the fsame Way as is described above.

While I have illustrated and described 'the preferred form of construction for carrying my invention into effect, this is capable of variation 'and modification, without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth., but desire to avail myself o such variations and modifications as come within the scope of the appended claim.

What I rclaim is:

A machine for pressing :grooves in pasteboard sheets comprising front rollers 'arranged in pairs,l

one roller of 'each .pair being arranged above .the other roller and the pairs of rollers being .spaced in an axial direction, groove forming means on said rollers, pairs of upper and lower rear rollers arranged Ybehind the front rollers, guiding means to give the sheeting a bow shape at points between and in front oi the pairs of front rollers, the .guide means Vbeing :arranged to bow the :sheet to such extent that after passing the front rollers the' REFERENCES CITED The following references are of record in the le 'oi this patent:

UNITED 4:STATES VPA'IEN'IS Number Name Date 591,209 Clark Oct. 5, 1897 999,909 Taylor 1---- Aug. 8, 1911 828,234 :Sw-ift Oct. 20, 1931' '941,484 Nasmith Jan. 2, 1934 Y2,022,563 'I-Iamrnisch Nov. 26, 1935 FOREIGN PATENTS Number Country Date 6,498 'Great'Britain' 1 1911 Germany Sept. 26, 1934 

